Hearing aid



FIG. 1 is a front view of a hearing aid embodying my design;

FIG. 2 is a rear view of the hearing aid shown in FIG. 1;

FIG. 3 is a first perspective view of the hearing aid shown in FIG. 1;

FIG. 4 is a second perspective view of the hearing aid shown in FIG. 1;

FIG. 5 is a right side view of the hearing aid shown in FIG. 1;

FIG. 6 is a bottom view of the hearing aid shown in FIG. 1;

FIG. 7 is a top view of the hearing aid shown in FIG. 1; and,

FIG. 8 is a left side view of the hearing aid shown in FIG. 1.

The broken line showing of the hearing aid is for the purpose of illustrating portions of the article that form no part of the claimed design. 

I claim the ornamental design for a hearing aid, as shown and described. 